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BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2020 | Jun. 30, 2019
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Statement Of Financial Position [Abstract] |  |
Accounts receivable, allowance for doubtful accounts | $ 446 | $ 411
Property and equipment, accumulated depreciation | $ 41,512 | $ 35,330
Common stock, shares authorized | 24,000,000,000 | 24,000,000,000
Common stock, outstanding | 7,590,000,000 | 7,643,000,000

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